Patent US5024915A successfully refreshed from Google Patents.
US5024915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positively chargeable developer
Assignee: Canon Inc
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Filing: 1989-11-16
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Granted: 1991-06-18
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Expires: 2009-11-16
Abstract
Abstract A developer for developing electrostatic latent images comprises a toner and a fine silica powder; said fine silica powder being treated with an aminosilane coupling agent having a tertiary amino group represented by the formula: ##STR1## wherein R 5 and R 6 represent the same or different substituents, provided that the total of the carbon atom number of R 5 and R 6 is not less than 8, and having an oxidation potential of not more than 800 mV.
Inventors
- 👤 Yukou Sato
- 👤 Tsutomu Kukimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:18
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08713; G03G9/0872; G03G9/097; G03G9/09708; G03G9/09716
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
79 words
A developer for developing electrostatic latent images, comprising a toner and a fine silica powder; said fine silica powder being treated with an aminosilane coupling agent having a tertiary amino group represented by the formula: ##STR6## wherein R 5 and R 6 represent the same or different substituents, provided that the total of the carbon atom number of R 5 and R 6 is not less than 8, and having an oxidation potential of nOt more than 800 mV.
Claim 2
Dependent Claim
79 words
A developer for developing electrostatic latent images, comprising a toner and a fine silica powder; said fine silica powder being treated with an aminosilane coupling agent having a tertiary amino group represented by the formula: ##STR6## wherein R 5 and R 6 represent the same or different substituents, provided that the total of the carbon atom number of R 5 and R 6 is not less than 8, and having an oxidation potential of nOt more than 800 mV.
Claim 3
Dependent Claim
34 words
A developer according to claim 1, wherein the fine silica powder treated with said aminosilane coupling agent is made hydrophobic to a degree of not less than 50, measured in a wetting degree test.
Claim 4
Dependent Claim
95 words
A developer according to claim 1, wherein said aminosilane coupling agent has a structure represented by the formula: ##STR7## wherein R 1 represents an alkoxy group; R 2 and R 3 may be the same or different and each represent an alkoxy group, an alkyl group or an aryl group; R 4 represents an alkylene group or a phenylene group; and R 5 and R 6 may be the same or different and each represents an alkyl group or an aryl group, provided that the alkylene group or phenylene group may have an amino group.
Claim 5
Dependent Claim
80 words
A developer according to claim 3, wherein R 1 represents an alkoxy group having 1 to 4 carbon atoms; R 2 and R 3 each represent an alkoxy group or alkyl group, each having 1 to 4 carbon atoms; R 4 represents an alkylene group having 2 to 1O carbon atoms or phenylene group; and R 5 and R 6 each represent an alkyl group having 2 to 12 carbon atoms or aryl group having 6 to 12 carbon atoms.
Claim 6
Dependent Claim
14 words
A developer according to claim 1, wherein said toner comprises a positively chargeable toner.
Claim 7
Dependent Claim
27 words
A developer according to claim 5, wherein said toner comprises a positively chargeable toner having an amount of triboelectric charges, of from +5 μc/g to +40 μc/g.
Claim 8
Dependent Claim
27 words
A developer according to claim 5, wherein said toner comprises a positively chargeable toner having an amount of triboelectric charges, of from +9 μc/g to +20 μc/g.
Claim 9
Dependent Claim
27 words
A developer according to claim 5, wherein said toner comprises a positively chargeable toner having an amount of triboelectric charges, of from +9 μc/g to +25 μc/g.
Claim 10
Dependent Claim
23 words
A developer according to claim 1, wherein said toner is mixed with a fine silica powder and negatively chargeable fine fluorine resin particles.
Claim 11
Dependent Claim
26 words
A developer according to claim 9, wherein said negatively chargeable fine fluorine resin particles have a primary average particle diameter of from 0.01 to 4 μm.
Claim 12
Dependent Claim
26 words
A developer according to claim 9, wherein said negatively chargeable fine fluorine resin particles have a primary average particle diameter of from 0.1 to 3 μm.
Claim 13
Dependent Claim
26 words
A developer according to claim 9, wherein said negatively chargeable fine fluorine resin particles have an amount of triboelectric charges, of -10 μc/g to -40 μc/g.
Claim 14
Dependent Claim
24 words
A developer according to claim 9, wherein said negatively chargeable fine fluorine resin particles have a degree of crystallization, of not less than 60%.
Claim 15
Dependent Claim
24 words
A developer according to claim 9, wherein said negatively chargeable fine fluorine resin particles have a degree of crystallization, of not less than 70%.
Claim 16
Dependent Claim
24 words
A developer according to claim 1, wherein said fine silica powder has an amount Of triboelectric charges, of from +100 μc/g to +300 μc/g.
Claim 17
Dependent Claim
33 words
A developer according to claim 1, wherein said fine silica powder is contained in an amount of from 0.05 to 10 parts by weight based on 100 parts by weight of the toner.
Claim 18
Dependent Claim
33 words
A developer according to claim 1, wherein said fine silica powder is contained in an amount of from 0.1 to 3 parts by weight based on 100 parts by weight of the toner.
Claim 19
Dependent Claim
63 words
A developer according to claim 9, wherein said fine silica powder is mixed in an amount of from 0.05 to 10 parts by weight based on 100 parts by weight of the tOner, and said negatively chargeable fine fluorine resin particles are mixed in an amount of from 0.01 to 5 parts by weight based on 100 parts by weight of the toner.
Claim 20
Dependent Claim
63 words
A developer according to claim 9, wherein said fine silica powder is mixed in an amount of from 0.1 to 3 parts by weight based on 100 parts by weight of the toner, and said negatively chargeable fine fluorine resin particles are mixed in an amount of from 0.05 to 2 parts by weight based on 100 parts by weight of the toner.
Claim 21
Dependent Claim
15 words
A developer according to claim 1, wherein said toner comprises a positively chargeable magnetic toner.
Claim 22
Dependent Claim
38 words
A developer according to claim 20, wherein said positively chargeable magnetic toner has an amount of triboelectric charges, of from +9 μc/g to +20 μc/g and has a volume average particle diameter of from 5 to 30 μm.
Claim 23
Dependent Claim
41 words
A developer according to claim 20, wherein said positively chargeable magnetic toner comprises a binder resin and magnetic fine particles; said magnetic fine particles being contained in an amount of from 10 to 70% by weight based on the toner weight.
Claim 24
Dependent Claim
34 words
A developer according to claim 22, wherein the fine silica powder treated with said aminosilane coupling agent is made hydrophobic to a degree of not less than 50, measured in a wetting degree test.
Claim 25
Dependent Claim
95 words
A developer according to claim 23, wherein said aminosilane coupling agent has a structure represented by the formula: ##STR8## wherein R 1 represents an alkoxy group; R 2 and R 3 may be the same or different and each represent an alkoxy group, an alkyl group or an aryl group; R 4 represents an alkylene group or a phenylene group; and R 5 and R 6 may be the same or different and each represents an alkyl group or an aryl group, provided that the alkylene group or phenylene group may have an amino group.
Claim 26
Dependent Claim
79 words
A developer according to claim 24, wherein R 1 represents an alkoxy group having 1 to 4 carbon atoms; R 2 and R 3 each represent an alkoxy group or alkyl group, each 1 to 4 carbon atoms; R 4 represents an alkylene group having 2 to 10 carbon atoms or phenylene group; and R 5 and R 6 each represent an alkyl group having 2 to 12 carbon atoms or aryl group having 6 to 12 carbon atoms.
Claim 27
Dependent Claim
23 words
A developer according to claim 22, wherein said toner is mixed with a fine silica powder and negatively chargeable fine fluorine resin particles.
Claim 28
Dependent Claim
26 words
A developer according to claim 26, wherein said negatively chargeable fine fluorine resin particles have a primary average particle diameter of from 0.01 to 4 μm.
Claim 29
Dependent Claim
25 words
A developer according to claim 26, wherein said negatively chargeable fine fluorine resin particles have a primary average particle diameter of 0.1 to 3 μm.
Claim 30
Dependent Claim
26 words
A developer according to claim 26, wherein said negatively chargeable fine fluorine resin particles have an amount of triboelectric charges, of -10 μc/g to -40 μc/g.
Claim 31
Dependent Claim
24 words
A developer according to claim 26, wherein said negatively chargeable fine fluorine resin particles have a degree of crystallization, of not less than 60%.
Claim 32
Dependent Claim
24 words
A developer according to claim 26, wherein said negatively chargeable fine fluorine resin particles have a degree of crystallization, of not less than 70%.
Claim 33
Dependent Claim
24 words
A developer according to claim 26, wherein said fine silica powder has an amount of triboelectric charges, of from +100 μc/g to +300 μc/g.
Claim 34
Dependent Claim
33 words
A developer according to claim 24, wherein said fine silica powder is contained in an amount of from 0.05 to 10 parts by weight based on 100 parts by weight of the toner.
Claim 35
Dependent Claim
33 words
A developer according to claim 24, wherein said fine silica powder is contained in an amount of from 0.1 to 3 parts by weight based on 100 parts by weight of the toner.
Claim 36
Dependent Claim
63 words
A developer according to claim 26, wherein said fine silica powder is mixed in an amount of from 0.05 to 10 parts by weight based on 100 parts by weight of the toner, and said negatively chargeable fine fluorine resin particles are mixed in an amount of from 0.01 to 5 parts by weight based on 100 parts by weight of the toner.
Claim 37
Dependent Claim
63 words
A developer according to claim 26, wherein said fine silica powder is mixed in an amount of from 0.1 to 3 parts by weight based on 100 parts by weight of the toner, and said negatively chargeable fine fluorine resin particles are mixed in an amount of from 0.05 to 2 parts by weight based on 100 parts by weight of the toner.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |